TiVo Apple App -- issues connecting over wifi when away from home

Has anyone else noticed that when trying to connect to TiVo app when outside of the home network, you get error messages when trying to log in? Fr example, I am at work and my iPhone is connecting to work wifi, I can't use tivo app. However if I switch wifi off and connect via LTE network, then TiVo app works.

Annoying to have to toggle back and forth. Wonder if this is a bug or just unique to me?